DA* 55mm suddenly not auto-focusing on a K5

Started Oct 7, 2012 | Discussions thread
Barry Pearson
Barry Pearson Veteran Member • Posts: 7,656
Re: DA* 55mm suddenly not auto-focusing on a K5

Petroglyph wrote:

My DA* 55mm f1.4 has been calibrated and working perfectly for some time now.  All of a sudden the lens hunts and won't lock in focus.  I've not had that happen before and have taken a lot of images over time.  It hunts in low light also in relatively good light. Focus only locks in on about 1 in 10 tries.  I changed batteries same result.  I put my Tamron lens on the camera and the Tamron still focuses perfectly on every try under the same conditions - so it isn't the camera.  Anyone have some ideas as the focus motor still seems to be in operation?  I'll take an FA43mm to my next but this is my only weatherproof lens.  Suggestions appreciated.

My first DA* 55mm f/1.4 was delivered with exactly that fault. (Or perhaps worse - it never locked in).

I sent it back and got a replacement that works (so far!)

 Barry Pearson's gear list:Barry Pearson's gear list
Panasonic LX100 Pentax K-3 II Pentax K-1 Pentax smc DA* 55mm F1.4 SDM Pentax smc DA 10-17mm F3.5-4.5 ED (IF) Fisheye +20 more
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